Preparation And Tribological Performance Of Oil-soluble Silicate Particle

Nowadays lubricating oil is the most widely used lubricating material, and the green and environment-friendly lubricating additive is becoming a new research direction. Along with the development of nanotechnology, The nanoparticles as additives are widely applied in production. With distinctive layered-structure, silicate particles can reduce the friction effectively and have the anti-wear role, so the research about silicate particles as a new kind of eco-friendly lubricant additives has good theoretical significance and application value.Based on the surface modification, two different kinds of talcum powder are prepared, one is intercalated by dimethyl sulfoxide, and the other is modified by oleic acid. The average particle size is 2.7um and 3.6um, and the stability and the dispersion in base oil is improved. Research results about tribological properties of the compound oil through the four-ball tester show that the modified talcum powder has good friction-reducing characteristic.By the Metathesis and in-situ modification method, amorphous magnesium silicate particles are chemically synthesized, with high purity, small particle size and oil-soluble advantages. Several parallel tests draw the optimum synthesis conditions: reaction temperature is 65℃, PH value of the Solution is 9, the ratio of stoffmenge of sodium silicate and magnesium chloride is 4.5:3 and the reaction time is 6 hours. Friction tests show that friction coefficient reduces about 40%, grinding spot diameter reduces about 50%, and PB value increases about 46%.Through scanning electron microscope and the energy spectrum analysis, the friction surface is relatively smooth, with much Mg and Si elements existed. The principle of friction-reducing action is supposed that the talcum powder, similar to the sphere, may form a layer of physical adsorption film in the contact area, and effects as supporting bearing, which can isolate the friction surface. In high load condition, the polar molecules in oil-soluble magnesium silicate form chemical adsorption membrane, which has low shear strength.This thesis is about the preparing of oil-soluble magnesium silicate particles, and their tribological properties as lubricant additive. The results show that silicate particles have excellent abrasion and extreme pressure resistance. Silicate particles used as a new type of green environmental protection lubricant additives will have a broad application prospect.